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    • 10. 发明授权
    • Companding noise reduction system with simultaneous encode and decode
    • 压缩降噪系统同时进行编码和解码
    • US06556685B1
    • 2003-04-29
    • US09188003
    • 1998-11-06
    • Robin M. UrryRoger T. Johnsen
    • Robin M. UrryRoger T. Johnsen
    • H04B1500
    • H03G7/004
    • A system and method for reducing noise in an audio signal. The system includes an encoder, a decoder and a single feedforward sidechain for generating a control signal that is used as input to a variable gain element in the encoder and in the decoder. The system is substantially audibly transparent, minimizes audible noise modulation, minimizes dynamic distortion of low frequency signals due to a level detector tracking these waveforms, minimizes distortion of signals due to phase shift in a transmission channel, minimizes distortion of fast, high-level transients due to the attack time of the level detector, and has virtually no effect on the audio signal if the level of the signal stays within a reasonable range around the nominal signal level.
    • 一种降低音频信号噪声的系统和方法。 该系统包括编码器,解码器和单个前馈侧链,用于产生用作编码器和解码器中的可变增益元件的输入的控制信号。 该系统基本上是可听见的透明度,使可听噪声调制最小化,由于电平检测器跟踪这些波形,使得低频信号的动态失真最小化,使由于传输通道中的相移引起的信号失真最小化,使快速,高电平瞬变的失真最小化 由于电平检测器的发射时间,并且如果信号电平保持在标称信号电平周围的合理范围内,则对音频信号几乎没有影响。